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Volume 18 Issue 1

Jan.  2001

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2001 >  18(1): 67-86

On the Helicity Dynamics of Severe Convective Storms

  • 1.

    Laboratory of Meso-scale Severe Weather, Department of Atmospheric Sciences,Nanjing University, Nanjing 210093,Laboratory of Meso-scale Severe Weather, Department of Atmospheric Sciences,Nanjing University, Nanjing 210093


doi: 10.1007/s00376-001-0005-5

  • A well-documented supercell thunderstorm occurred in Del City, Oklahoma, on 20 May 1977 is successfully simulated by a three-dimensional, nonhydrostatic storm-scale numerical model ARPS. With the numerical simulated data of the storm, the structure and evolution of the helicity, superhelicity and their dynamical influences on the development of the storm are investigated. The initial helical structure of environmental flow is favorable to the development of storm. In the developing stage of storm, low helicity is beneficial to the nonlinear energy cascade. However, the high helicity is of help to maintain the energy of convection cell at the mature stage of storm, and lead to a long life cycle of convective cell. Rotating thunderstorm has a tendency of adjusting to the Beltrami flow structure and tends to a higher helicity of flow.The negative superhelicity could lead to an increase of helicity. Superhelicity is negative in the initial developing process of storm however the superhelicity is positive in the mature stage of storm. Therefore, the superhelicity can be used as an indicator of the mature degree of convective storm.
  • [1] HAN Ying, WU Rongsheng, FANG Juan, 2006: Shearing Wind Helicity and Thermal Wind Helicity, ADVANCES IN ATMOSPHERIC SCIENCES, 23, 504-512.  doi: 10.1007/s00376-006-0504-5
    [2] XU Yamei, WU Rongsheng, 2003: The Conservation of Helicity in Hurricane Andrew (1992) and the Formation of the Spiral Rainband, ADVANCES IN ATMOSPHERIC SCIENCES, 20, 940-950.  doi: 10.1007/BF02915517
    [3] Ding Jincai, Dai Jianhua, Chen Yamin, Hu Fuquan, Tang Xinzhang, 1996: Helicity as a Method for Forecasting Severe Weather Events, ADVANCES IN ATMOSPHERIC SCIENCES, 13, 533-538.  doi: 10.1007/BF03342043
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    [6] Yang LI, Yubao LIU, Rongfu SUN, Fengxia GUO, Xiaofeng XU, Haixiang XU, 2023: Convective Storm VIL and Lightning Nowcasting Using Satellite and Weather Radar Measurements Based on Multi-Task Learning Models, ADVANCES IN ATMOSPHERIC SCIENCES, 40, 887-899.  doi: 10.1007/s00376-022-2082-6
    [7] WANG Donghai, Xiaofan LI, Wei-Kuo TAO, 2010: Responses of Vertical Structures in Convective and Stratiform Regions to Large-Scale Forcing during the Landfall of Severe Tropical Storm Bilis (2006), ADVANCES IN ATMOSPHERIC SCIENCES, 27, 33-46.  doi: 10.1007/s00376-009-8139-y
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    [9] Gang FU, Pengyuan LI, Lijia CHEN, Yongmao PENG, Jing NI, 2023: Historic and Future Perspectives of Storm and Cyclone, ADVANCES IN ATMOSPHERIC SCIENCES, 40, 447-463.  doi: 10.1007/s00376-022-2184-1
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    • Manuscript History

    Manuscript received: 10 January 2001
    Manuscript revised: 10 January 2001
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    On the Helicity Dynamics of Severe Convective Storms

    • 1. Laboratory of Meso-scale Severe Weather, Department of Atmospheric Sciences,Nanjing University, Nanjing 210093,Laboratory of Meso-scale Severe Weather, Department of Atmospheric Sciences,Nanjing University, Nanjing 210093
    • Manuscript received: 2001-01-10
    • Manuscript revised: 2001-01-10

    Abstract: A well-documented supercell thunderstorm occurred in Del City, Oklahoma, on 20 May 1977 is successfully simulated by a three-dimensional, nonhydrostatic storm-scale numerical model ARPS. With the numerical simulated data of the storm, the structure and evolution of the helicity, superhelicity and their dynamical influences on the development of the storm are investigated. The initial helical structure of environmental flow is favorable to the development of storm. In the developing stage of storm, low helicity is beneficial to the nonlinear energy cascade. However, the high helicity is of help to maintain the energy of convection cell at the mature stage of storm, and lead to a long life cycle of convective cell. Rotating thunderstorm has a tendency of adjusting to the Beltrami flow structure and tends to a higher helicity of flow.The negative superhelicity could lead to an increase of helicity. Superhelicity is negative in the initial developing process of storm however the superhelicity is positive in the mature stage of storm. Therefore, the superhelicity can be used as an indicator of the mature degree of convective storm.

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